SYSTEM AND METHOD FOR DETECTING THE GROUND AND MICROPHONE INPUT CONTACTS IN AN AUDIO PLUG
First Claim
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1. A system comprising:
- a mobile computing device comprising an audio plug, wherein said audio plug comprises first and second contacts;
a peripheral device comprising an audio jack, and a microprocessor; and
a circuit connecting the audio jack and the microprocessor and used for detecting a microphone-in (MIC-IN) and a ground (GND) among the first and second contacts of the audio plug, wherein the MIC-IN comprises a higher voltage than the GND.
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Abstract
A circuit for detecting the position of the signal MIC-IN and GND on the audio plug of a mobile phone includes two comparators and two switches. The comparators compare the voltage difference between the two contact points representing MIC-IN and GND of the audio plug of a mobile phone, and through this comparison the ground signal of the mobile phone is identified. The circuit then connects the ground of the accessory and the mobile phone properly, by activating the appropriate switch.
97 Citations
20 Claims
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1. A system comprising:
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a mobile computing device comprising an audio plug, wherein said audio plug comprises first and second contacts; a peripheral device comprising an audio jack, and a microprocessor; and a circuit connecting the audio jack and the microprocessor and used for detecting a microphone-in (MIC-IN) and a ground (GND) among the first and second contacts of the audio plug, wherein the MIC-IN comprises a higher voltage than the GND. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A circuit comprising:
a first comparator connected to a first switch and a second comparator connected to a second switch and wherein the first comparator connects to first and second contacts of an audio plug and measures a first voltage between the first and second contacts and the second comparator connects to the first and second contacts of the audio plug in a reverse way and measures a second voltage between the first and second contacts and wherein the circuit further compares the first and second voltages between the first and second contacts and thereby identifies a MIC-IN and GND among the first and second contacts of the audio plug.
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20. A method for detecting a microphone-in (MIC-IN) and a ground (GND) in a mobile computing device comprising:
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providing a mobile computing device comprising an audio plug, wherein said audio plug comprises first and second contacts; providing a peripheral device comprising an audio jack, and a microprocessor; and providing a circuit connecting the audio jack and the microprocessor and used for detecting a microphone-in (MIC-IN) and a ground (GND) among the first and second contacts of the audio plug, wherein the MIC-IN comprises a higher voltage than the GND.
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Specification